Weekend Roundup: 08/14

Presumptive Democratic presidential nominee Joe Biden officially announces his running mate -- Senator Kamala Harris. More controversy involving the U.S. Postal Service and mail-in ballots leading up to the November election. Stalled negotiations between Democrats and Republicans leaves the nation without a new COVID-19 relief bill. Chicago's leaders announce new initiatives to stop looting. Plus -- further discussion with parents deciding whether or not to send their children back to school amid the pandemic. CBS News Correspondent Allison Keyes will have these stories and more on the CBS News Weekend Roundup.